CCTV Troubleshooting Guide for Indian Factories: Symptom → Cause → Fix
This table maps common factory CCTV faults in India to six cause groups: Jio/Airtel carrier-grade NAT (router WAN address inside 100.64.0.0/10), 50 Hz light flicker, cameras on the wrong NVR network segment, an exceeded PoE budget, cable runs past 100 m, and heat, dust or unstable power. Find the symptom, do the first check, open the linked page.
Verified against
- IETF RFC 6598 (CGNAT space); CERC order 2/SM/2025 (29.03.2025, quoting IEGC 2023 Reg. 30); TI SLYT784 (4Q 2019, PoE classes).
- Uniview, How to Connect Uniview Cameras to a PoE NVR? V1.0 (21 Nov 2023) and NVR Quick Guide V1.01 (safety section).
- TP-Link Omada, How to Fix Flickering or Rolling Bands in Omada Camera Live View (30 Jul 2026), and Reolink, What is Anti-flicker.
- Axis, IR reflections in dome cameras (May 2021); i-PRO, How to prevent IR reflection; Axis M2036-LE specifications.
- Western Digital, WD Purple product brief (2024-01); IMD, Heat wave definition; ONVIF, Profile S; IEC, IEC 60529 (IP Code).
- Hikvision, NVR User Manual V4.1.70 (2018) and Hikvision Europe, How to add third-party IP camera to NVR with Plug&Play method (2 Jun 2016); Hikvision camera User Manual V5.6.5 (login lock).
- Checked 7 Oct 2026.
Symptom → likely cause → first check
| Symptom | Likely cause | First check | Go to | Source |
|---|---|---|---|---|
| Live view works on the factory Wi-Fi but not from outside. Port forwarding on the Jio/Airtel router does nothing | Carrier-grade NAT: one public IPv4 address shared across many customers | Compare the router's WAN IP with a "what is my IP" site. If the WAN IP is in 100.64.0.0/10 (100.64.x.x to 100.127.x.x), you are behind CGNAT; if the two numbers simply differ, there is NAT upstream either way. | Remote view behind Jio/Airtel CGNAT | RFC 6598 |
| Dark bands roll across the picture indoors under LED or tube lights. Outdoors it looks fine | The camera shutter doesn't match the light's flicker. Indian mains run at 50 Hz. | Set the power-line frequency or anti-flicker to 50 Hz (not 60). If the image then over-exposes, Omada's advice is manual exposure and a gradually slower shutter. | CCTV flicker under 50 Hz LED lights | Omada, IEGC via CERC |
| The NVR "Auto Search" can't find a camera, or the camera shows offline | Camera on the wrong NVR segment (PoE vs LAN), or wrong protocol (vendor-private vs ONVIF) | Note which NVR port the camera is plugged into. The camera must be in the same IP segment as that port's NIC. | NVR not detecting IP camera | Uniview PoE NVR note |
| Cameras drop or reboot after you add more of them to a PoE switch or NVR | Total PoE budget exceeded, or a camera needs a higher class than the port gives. | Add up each camera's maximum datasheet draw; compare with the total PoE budget, and each class with its port. | PoE budget for factory cameras | TI SLYT784, Uniview quick guide |
| A camera works on the bench and fails at the far end of the shed | The cable run is longer than 100 m. | Measure the actual cable path, not the straight-line distance. Past 100 m, add a switch or extender partway, or use fibre (our suggestion). Some Hikvision NVRs have a PoE Long Distance mode for 100–300 m, capped at 6 MP. | NVR not detecting IP camera | TI SLYT784, Hikvision NVR V4.1.70 |
| The image is sharp by day but foggy or washed out at night | IR light reflects off dust, spider webs or a nearby wall back into the lens. | Clean the dome (mild soap, water, microfibre cloth). Keep the IR cone clear of walls and ceilings. | (answer inline) | Axis, i-PRO |
| The NVR freezes, or the HDD throws errors, in May and June | Heat. The drive or NVR is above its rated range, or the vents are blocked. | Check where the NVR sits (closed cabinet, near a furnace, under roof sheet) against its datasheet range. | (answer inline) | WD Purple, Uniview quick guide |
| Recording gaps or wrong timestamps after power cuts | Unstable supply. The clock is not synced to NTP. | Are the NVR and PoE switch on a stable or backed-up supply? Is NTP set, time zone IST (GMT+05:30)? | CP Plus or Prama/Hikvision settings pages (below) | Uniview quick guide |
| Password forgotten or the camera locked out | Default credentials changed and not recorded, or a lockout after repeated failed logins | If it is a lockout, fix the password saved on the NVR or VMS and wait: with Hikvision's Illegal Login Lock on, 7 failed admin logins block that IP for 30 minutes. Otherwise use the brand's reset or activation procedure. | CP Plus factory settings, Prama/Hikvision factory settings | Hikvision V5.6.5 |
| A third-party VMS or analytics tool can't pull the stream | Wrong RTSP path, ONVIF disabled, or no ONVIF user | Confirm the RTSP URL for the brand. Confirm ONVIF (Profile S covers video streaming and configuration) is enabled; from Hikvision firmware V5.5.0 the how-to has you enable ONVIF and add a separate ONVIF user. ONVIF is deprecating Profile S (last conformance submissions 31 Mar 2027). | RTSP/ONVIF cheat sheet | ONVIF Profile S, Hikvision ONVIF how-to |
Where brands differ
- PoE NVR ports. Uniview: the internal PoE NIC and external Ethernet NIC "must be set up to different IP segments", and each PoE port takes one camera, never a switch (Uniview V1.0, 2023). Hikvision ties Plug-and-Play to the NVR's own PoE ports: a camera "physically connected to the PoE interface", whose parameters can't be edited (NVR manual V4.1.70). For a third-party camera, Hikvision's Plug&Play guide (2016) asks for an IP in the NVR's Internal NIC segment with a last octet above 100, and a camera password of
12345or the NVR's admin password (guide). CP Plus and Prama: see CP Plus RTSP and ONVIF setup and Prama/Hikvision RTSP and ONVIF setup. - Anti-flicker naming. Hikvision calls it Video Standard (50 Hz/60 Hz), Dahua and CP Plus Anti-flicker (50Hz/60Hz/Outdoor), Uniview an Exposure Mode "Indoor 50Hz"; menu paths and manuals are on the flicker page. Omada splits it into Power Line Frequency and an Anti-flicker toggle that may over-expose (Omada); Reolink recommends off outdoors (Reolink).
- Operating temperature is per model, not per brand. Example: Axis lists the M2036-LE at −30 to 50 °C (Axis).
What breaks in a factory
Heat. IMD's heat-wave criterion for the plains is a station at 40 °C or more and at least 4.5 °C above normal, or an actual maximum of 45 °C or more (IMD). Under a metal roof a camera can run hotter than reported air temperature (our assumption; measure), so a 50 °C rating leaves little margin. WD Purple drives are rated 0–65 °C on the base casting, with MTBF stated at 40 °C drive temperature and derated above it (WD Purple brief, 2024-01).
Dust and lint. An IP66/IP67 rating is about the enclosure (IEC 60529, "degrees of protection provided by enclosures"). It doesn't stop dust on the outside of the dome from reflecting IR at night. Axis names dirt, dust and spider webs; i-PRO says IR reflection "occurs mostly due to the dirt or dust on the dome or front cover". Put dome cleaning in the AMC contract.
50 Hz mains. IEGC 2023 sets India's reference frequency at 50.000 Hz, allowable band 49.900–50.050 Hz (CERC order, 2025). A camera left on 60 Hz bands under high-bay LEDs and tube lights.
PoE budget and long runs. Per TI's 802.3af/at table, a Class 3 port supplies 15.4 W and the camera may draw up to 12.95 W. A Class 4 (802.3at) port supplies 30 W, of which the camera may draw up to 25.5 W (TI SLYT784). Our reading: the gap is the allowance for cable loss, so budget from the PSE figure.
Power cuts. Uniview requires "a stable voltage" and lists temperature, humidity, dust and corrosive gases as environmental limits. With frequent cuts and DG changeovers, our recommendation (not Uniview's) is a UPS for the NVR and PoE switch.
When to call the installer / what to ask the vendor
Call the installer for physical faults: runs over 100 m, undersized PoE switch, unventilated NVR panel, domes to clean at height. Ask the vendor, in writing: the box's total PoE budget, whether ONVIF needs a firmware update, and the model's upper operating temperature.
Where Mama fits
Once cameras are stable, Mama reads the factory's existing RTSP/ONVIF streams and reports machine idle time to the owner in plain language. Leave an email or phone in the form below.
FAQ
Why doesn't port forwarding work on my Jio Fiber connection for the NVR? If the router's WAN IP is in 100.64.0.0/10, the connection is behind carrier-grade NAT (RFC 6598). Incoming connections never reach your router; users on techenclave report the same on JioFiber (thread). You need a public IP from the ISP, the vendor's P2P service, or a VPN. Details are on the CGNAT page.
Why do my IP cameras keep going offline on the NVR when they are on a PoE switch? Usually a segment mismatch: per Uniview, cameras on an external switch belong in the NVR's LAN segment, not its PoE-port segment, and a switch must not hang off an NVR PoE port. Drops that start as cameras are added point to the PoE budget.
Why is my CCTV picture flickering only indoors? Exposure doesn't match 50 Hz light flicker; set anti-flicker to 50 Hz. See the flicker fix page.